With the charging circuit off, the receiver and telemetry equipments
continue to draw constant power from the batteries. (Electrically,
power = voltage x current). As the battery voltage gets lower,
the current increase to the point of failure. In the case of the
Ashtech receivers BSL engineers have found the on/off switch is a
circuit breaker. The breaker trips at low voltage (high current) levels.
After an extended power outage, the receiver appears to have been turned off.
The low voltage cut-off device protects equipment, and eliminates the need
to visit a station after an extended power outage.
Low-voltage cut-off devices were installed at all new stations and stations
at SAOB, YBHB, FARB, SUTB and CMBB were upgraded with the devices.